<template>
  <view>
    <view class="scroll-view-container">
      <!-- 左侧的滚动视图区域 -->
  <!-- 左侧的滚动视图区域 -->
  <scroll-view class="left-scroll-view" scroll-y :style="{height: wh + 'px'}" :scroll-top="scrollTop">
    <block v-for="(item, i) in cateList" :key="i">
      <view :class="['left-scroll-view-item', i === active ? 'active' : '']" @click="activeChanged(i)">{{item.cat_name}}</view>
    </block>
  </scroll-view>
      <!-- 右侧的滚动视图区域 -->
     <!-- 右侧的滚动视图区域 -->
     <scroll-view class="right-scroll-view" scroll-y :style="{height: wh + 'px'}">
       <view class="cate-lv2" v-for="(item2, i2) in cateLevel2" :key="i2">
         <view class="cate-lv2-title">/ {{item2.cat_name}} /</view>
		  <view class="cate-lv3-list">
		       <!-- 三级分类 Item 项 -->
		       <view class="cate-lv3-item" v-for="(item3, i3) in item2.children" :key="i3" @click="gotoGoodsList(item3)">
		         <!-- 图片 -->
		         <image :src="item3.cat_icon"></image>
		         <!-- 文本 -->
		         <text>{{item3.cat_name}}</text>
		       </view>
		     </view>
       </view>
     </scroll-view>
    </view>
  </view>
</template>
<script>
	export default {
		data() {
			return {
				wh:0,
				cateList: [],
				 active: 0,
				  cateLevel2: [],
				   scrollTop: 0
			};
		},
		onLoad(){
			       // 获取当前系统的信息
			             const sysInfo = uni.getSystemInfoSync()
			      // 为 wh 窗口可用高度动态赋值
			      this.wh = sysInfo.windowHeight
				  this.getCateList()

		},
		methods:{
		async getCateList(){
			const { data:res} = await uni.$http.get('/api/public/v1/categories')
			if(res.meta.status !=200) return uni.$showMsg()
			this.cateList = res.message
		},
		activeChanged(i){
			this.active = i
			this.cateLevel2 = this.cateList[i].children
			 this.scrollTop = this.scrollTop === 0 ? 1 : 0
		},
		async getCateList() {
		  const { data: res } = await uni.$http.get('/api/public/v1/categories')
		  if (res.meta.status !== 200) return uni.$showMsg()
		  this.cateList = res.message
		  // 为二级分类赋值
		  this.cateLevel2 = res.message[0].children
		},
		gotoGoodsList(item3) {
		  uni.navigateTo({
		    url: '/subpage/goods_list/goods_list?cid=' + item3.cat_id
		  })
		}
		}
	}
</script>

<style lang="scss">
.scroll-view-container {
  display: flex;

  .left-scroll-view {
    width: 120px;

    .left-scroll-view-item {
      line-height: 60px;
      background-color: #f7f7f7;
      text-align: center;
      font-size: 12px;

      // 激活项的样式
      &.active {
        background-color: #ffffff;
        position: relative;

        // 渲染激活项左侧的红色指示边线
        &::before {
          content: ' ';
          display: block;
          width: 3px;
          height: 30px;
          background-color: #c00000;
          position: absolute;
          left: 0;
          top: 50%;
          transform: translateY(-50%);
        }
      }
    }
  }
}
.cate-lv2-title {
  font-size: 12px;
  font-weight: bold;
  text-align: center;
  padding: 15px 0;
}
.cate-lv3-list {
  display: flex;
  flex-wrap: wrap;

  .cate-lv3-item {
    width: 33.33%;
    margin-bottom: 10px;
    display: flex;
    flex-direction: column;
    align-items: center;

    image {
      width: 60px;
      height: 60px;
    }

    text {
      font-size: 12px;
    }
  }
}
</style>
